Bed mattress

ABSTRACT

Disclosed is a mattress used for a bed, and more particularly, to a mattress of which resilience is not easily deteriorated and its deformation may be avoided even though it is used for a long time, and cushions on the top and bottom sides of which may be made of materials with different resiliences. The present invention provides a bed mattress which comprises a spring frame  10  with a plurality of springs arranged side by side with certain intervals therein, two pad layers  13  disposed respectively on the top and bottom of said spring frame  10,  a side sheet  20  wrapping four sides of said spring frame and two cushion portions  10   a  placed respectively on the two pad layers ; characterized in that said cushion portions  10   a  comprise a cushion member  60,  a cover sheet  70  disposed on or under said cushion member  60,  and two envelope sheets  32,  first halves of which surround perimeters and bottom surfaces extending therefrom of said cushion members  60  and second halves of which are folded back so as to cover perimetric portions of each said pad layer  13,  leaving a gap between the opposing sufaces of the folded first and second halves.

FIELD OF THE INVENTION

[0001] The present invention relates to a mattress used for a bed, andmore particularly, to a mattress of which resilience is not easilydeteriorated and its deformation may be avoided even though it is usedfor a long time, and cushions on the top and bottom sides of which maybe made of materials with different resiliences.

BACKGROUND OF THE INVENTION

[0002] In a conventional mattress, a spring frame, which has a pluralityof springs arranged at regular intervals, is mounted therein. A coversheet is put on the top and bottom of the spring frame respectively, andfour sides of the spring frame are enveloped in a side sheet. Then, thetop and bottom edges of the side sheet are folded over perimetricportions of the cover sheets so as to be seamed together with a seamingsheet.

[0003] The cover sheet or side sheet is made by sequentially overlayinga sponge sheet and a fabric cloth on a nonwoven fabric and then bystitching them altogether. However, there is a limitation on theirthicknesses due to the structure.

[0004] Since the cover sheet of the conventional mattress is relativelythin, it can hardly not serve as a primary buffer absorbing the pressureor the shock caused by the weight of the user and is liable to be easilydamaged. Therefore, the pressure or the shock is applied almost directlyto the spring frame so that the elasticity of the spring is easilyweakened, resulting in shortened life of the mattress as a whole.

[0005] Particularly, the conventional mattress can not provide its userwith a variety of resiliences, which depend mostly on the material andstructure of the built-in spring frame. Thus, you can hardly find amattress with a desirable resilience(s).

[0006] Further, the perimetric portion of the cover sheet is compressedand thinned by stitching in the course of the manufacturing. That is,the lowered edges of the cover sheet make the shape of the mattresshomely, affecting the commercial value of the mattress.

SUMMARY OF THE INVENTION

[0007] An object of the present invention is to make a mattress of whichlife may be prolonged and which can provide the cushion sheets on itstop and bottom with different resiliences to be chosen by the user, bysolving the problems of the conventional mattress as mentioned above.

[0008] Another object of the present invention is to provide a mattress,of which the shape and the commercial value as well are enhanced.

[0009] In order to achieve the above-mentioned objects of the presentinvention, there is provided a mattress comprising a spring frame havinga plurality of springs arranged side by side therein, a pad layerdisposed on both or either of top side and bottom side of the springframe, a side sheet wrapping the four perimetric side portions of thehexaderon as a combination of the spring frame and the pad layer(s), andone or two cushion portions arranged on the pad layer(s); so that eitherend portion of the pad layer(s) are spaced apart from the opposingsurface of an outer perimeter of the cushion portion. The cushionportion comprises a cushion member made by bonding a compressed padlayer and a sponge sheet, a cover sheet stacked on the cushion memberand an envelope sheet which envelops perimeters of the cushion memberand the cover sheet together. According to the present invention, it isalso possible to make resiliences of the cushion portions on the top andbottom sides different.

[0010] The mattress of the present invention is made such that theweight of a user and the pressure and shock caused during in use by theuser may be absorbed or dispersed by the cushion member and thus not betransferred directly to the spring frame, making elasticity of thesprings maintained for a long time. Consequently, the cover sheet maynot be easily damaged.

BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Hereinafter, embodiments of the present invention will bedescribed in detail with reference to the accompanying drawings, inwhich

[0012]FIG. 1 is a partial perspective view of a bed mattress accordingto a first embodiment of the present invention,

[0013]FIG. 2 is an enlarged sectional view of the mattress in FIG. 1,

[0014]FIG. 3 is an enlarged sectional view of the mattress in FIG. 1,

[0015]FIG. 4 is a partial side view of a bed mattress according to asecond embodiment of the present invention,

[0016]FIG. 5 is an enlarged sectional view of the mattress in FIG. 4,

[0017]FIG. 6 is a partial enlarged sectional view of a bed mattressaccording to a third embodiment of the present invention, and

[0018]FIG. 7 is a partial enlarged sectional view of a bed mattressaccording to a fourth embodiment of the present invention.

DETAILED DESCRIPTION FOR PREFERRED EMBODIMENTS

[0019] FIGS. 1 to 3 are a perspective view and sectional views showing apart of the mattress according to a first embodiment of the presentinvention. The mattress comprises a spring frame 10 with a plurality ofsprings arranged side by side with certain intervals therein, two padlayers 13 disposed on the top and bottom sides of the spring frame 10, aside sheet 20 wrapping four sides of the spring frame, two cushionportions 10 a placed on the two pad layers 13 and having a thicknessdifferent from that of the pad layers 13; the cushion portion 10 acomprising a cushion member 60 formed by bonding a compressed pad layer61 and a sponge sheet 62; a cover sheet 70 which covers the top surfaceof the cushion member 60; and two envelope sheets 32, first halves ofwhich surround perimeters and bottom surfaces adjacent thereto of thecushion members 60 and second halves of which are folded back so as tocover perimetric portions of each pad layer 13, leaving a gap betweenthe opposing surfaces of the folded first and second halves.

[0020] The spring frame 10 has a plurality of springs 12 arranged sideby side at certain intervals between the upper and lower supporting rims11 made of a steel wire or the like.

[0021] An intermediate sheet 31, which is made of bonded textile andsponge sheets, may be interposed between the cushion member 60 and thepad layer 13 and placed under the second half of the envelope sheet 32,while it may be omitted.

[0022] For having the first and second halves of the envelope sheet 32attached to the perimeters and bottom surface adjacent thereto of thecushion member 60 and the perimetric surface of the intermediate sheet,the folded portions 321 of the envelope sheet 32 are sewn together onthe intermediate sheet 31, fixing the cushion member 60 to the pad layer13.

[0023] The perimetric portions of the envelope sheet 32 and theintermediate sheet 31 are overlaid on the top or bottom end of the sidesheet 20 so as to be surrounded by a seaming sheet 40 and sewnaltogether for binding.

[0024] Accordingly, the outside of the spring frame 10 and the cushionmember 60 disposed on the top or bottom thereof are fully covered andsurrounded by the envelope sheet 32 and the side sheet 20. An opening 50for receiving the cushion member 60 and the cover sheet 70 is formed bythe first half of the envelope sheet 32 with a depth that is inproportion to the latter's size. The cover sheet 70 is made by piling upa nonwoven fabric 71, a sponge sheet 72 and a cloth 73 one by one andits perimeters are placed on the end portion of the first half of theenvelope sheet 32 so as to be surrounded by the seaming sheet 40′ andthen stitched to be bound together.

[0025] The cushion member 60 is made by superposing and adhering acompressed pad layer 61 having appropriate thickness on a surface of asponge sheet 62 having a thickness thicker than the compressed padlayer.

[0026] If the sponge sheet 62 is of a high density, the resilience ofthe cushion member is hard, while the sponge sheet of a low densitygives a relatively soft resilience to the cushion member.

[0027] By the way, if required, the positions of the compressed padlayer 61 and the sponge sheet 62 may be reversed so as to provide arelatively harder resilience.

[0028] Thus, there is provided a mattress comprising the cushion portion10 a with an appropriate thickness, which has the cover sheet 70arranged on the top and bottom sides of the spring frame 10 and kept bythe envelope sheet 32. The cushion portion is arranged so that the firsthalf of the envelope sheet 32 extending from the folded part 321 may bespaced apart from the second half of the envelope sheet on the pad layer13.

[0029] First seam portions are formed by the seaming sheets 40 on bothend portions of the side sheet 20 and second seam portions arerespectively provided opposite each of the first seam portions by theseaming sheet 40′.

[0030] The two cushion portions can be made to have either an identicalresilience or different ones. The cushion member 60 may be provided witha metal wire reinforcing rim 63 interposed between the compressed padlayer 61 and the sponge sheet 62 for inwardly and upwardly supportingthe pad layer 61.

[0031] Because the top and bottom cushion members may have differentresiliences, one mattress can have two types of cushions portions 10 aso that the user can select and use either of the two types as desired.Since the reinforcing rims support the bottom portion of the outside ofthe cushion portion, they help the cushion portion keep its originalappearance and shape for a long time.

[0032]FIGS. 4 and 5 are respectively a side view and an enlargedsectional view showing a portion of a mattress according to a secondembodiment of the present invention.

[0033] The mattress according to this embodiment is different from thefirst embodiment in that the mattress comprises a second side sheet 20′surrounding between the outer surface of the cover sheet 70 and that ofthe cushion member 60 on either of the top and bottom of the springframe so that the perimetric portions of the cushion member 60 and thecover sheet 70 are spaced apart from each other, the perimetric portionof the cushion member 60 and one end portion of the second side sheet20′ are placed on the upper end of the first half of the envelope sheet32 and they are surrounded by a seaming sheet 40′ and then sewntogether; and the perimetric portion of the cover sheet 70 and the otherend of the second side sheet 20′ are surrounded by and sewn with theseaming sheet 40′, so that the second side sheet 20′ may surroundbetween the perimetric portions of the cushion member 60 and the coversheet 70.

[0034] In this manner, the side sheet 20′ surrounds between and connectsthe seaming sheets 40′, 40″ so that the perimetric portions of thecushion member 60 and the cover sheet 70 are connected to each other.

[0035] Accordingly, the top and bottom ends of the perimetric portion ofthe cushion portion 10 a are reinforced by means of the second and thirdseam portions made by sewing the seaming sheets 40′, 40″ and thus theoriginal form of the perimetric portion of the cushion portion 10 a isnot easily deformed even though it is used for a long time with orwithout the reinforcing rim 63 arranged in the cushion member 60.

[0036] On the other hand, although the cushion portion 10 a in the firstand second embodiments has been described as being made of thecompressed pad layer 61 and the sponge sheet 62, it is not limitedthereto. Any materials that can substitute for the functions of thecompressed pad layer and the sponge sheet may be used without departingfrom the scope of the present invention.

[0037]FIG. 6 is an enlarged sectional view showing a portion of amattress according to a third embodiment of the present invention as arevision of the first embodiment, which further comprises binding bands80 with binding pieces 81 on both ends thereof which penetrate throughthe pad layer 13 and the cushion member 60 for binding the layer 13 andthe member 60 together.

[0038]FIG. 7 is an enlarged sectional view showing a portion of amattress according to a fourth embodiment of the present invention asother revision of the first embodiment, which further comprises bindingbands 80 with binding pieces 81 on both ends thereof which penetratethrough the pad layer 13, the cushion member 60 and the cover sheet 70for binding the layer 13, the member 60 and the sheet 70 together.

[0039] When they are bound together in such a manner that the bindingbands 80 penetrate through the parts or members like the last twoembodiments, the cushion member 60 and the cover sheet 70 are securelybound together without producing any slippage therebetween.

[0040] Adhesives may be sprayed or applied on the surfaces where therespective members for constituting the cushion portion 10 a face eachother, or where the cushion portion 10 a and the pad layer 13 face eachother in order to bond them securely.

[0041] The members are united mutually so that the binding or sewingoperation after overlaying the respective members may be easilyperformed and the adhesion or contact between the neighboring membersare prevented during in use and deformation of the mattress may also beavoided.

[0042] According to the mattresses of the embodiments of the presentinvention, the cushion portions are arranged on both or either of thetop and bottom of the mattress, the pressure caused by the weight of theuser, the shock or the like applied during in use are primarilydispersed and absorbed by the cushion parts so as not to be transferreddirectly to the spring frame. Thus, the present invention has anadvantage that the life of the springs is prevented from being shortenedand the original shape of cushion can be maintained for a relativelylong time.

[0043] In addition, if the materials and the resulting resiliences ofthe cushion portions are different from each other, it is possiblefurther user to choose between the two different cushions in accordancewith the user's option. Furthermore, since the resiliences of edges ofthe mattress is reinforced by the cushion materials and the first tothird seam portions, the edges of the mattress are prevented fromsinking even though it is used for a long time. Thus, the area on themattress available to the user increases and the original shape thereofis maintained for a long time. Therefore, there are advantages that itsappearance is prevented from being damaged and the commercial valuethereof is enhanced.

[0044] Since the cover sheet is supported by the cushion member andseparated from the spring frame, it is not easily damaged, preventingthe life of the mattress from being shortened.

[0045] As the respective stacked overlaid members for constituting thecushion member and the cover sheet are bonded to each other or bound bymeans of the binding bands which penetrate through those members, therespective members are securely bound and united so as not to get out offirm contact with each other. Thus, the deformation of the mattress canbe prevented and the function of the cushion portions is maintainedduring a relatively long prolonged duration of use.

What is claimed is:
 1. A bed mattress comprising a spring frame 10 witha plurality of springs arranged side by side with certain intervalstherein, two pad layers 13 disposed respectively on the top and bottomof said spring frame 10, a side sheet 20 wrapping four sides of saidspring frame and two cushion portions 10 a placed respectively on thetwo pad layers, characterized in that said cushion portions 10 acomprise a cushion member 60, a cover sheet 70 disposed on or under saidcushion member 60, and two envelope sheets 32, first halves of whichsurround perimeters and bottom surfaces extending therefrom of saidcushion members 60 and second halves of which are folded back so as tocover perimetric portions of each said pad layer 13, leaving a gapbetween the opposing sufaces of the folded first and second halves.
 2. Abed mattress according to claim 1, said cushion member 60 is formed bybonding a compressed pad layer 61 and a sponge sheet
 62. 3. A bedmattress according to claims 1 or 2, said cushion members 60 arerespectively provided with a reinforcing rim 63 interposed between saidcompressed pad layer 61 and sponge sheet 62 for inwardly and upwardlysupporting said compressed pad layer
 61. 4. A bed mattress according toclaims 1 or 2, said compressed pad layer 61 and sponge sheet 62, saidcushion member 60 and pad layer 13, and said cushion member 60 and coversheet 70 are adhered to one another by means of an adhesive appliedthere between.
 5. A bed mattress according to claims 1 or 2, saidcushion member 60 and pad layer 13 are bound together by one or morebinding bands or straps penetrating there through.
 6. A bed mattressaccording to claims 1 or 2, said cover sheet 70, cushion member 60 andpad layer 13 are bound together by one or more binding bands or strapspenetrating therethrough.